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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Fixed! Sorry about that - it was a bit of a mess :( It'll be in the latest Git build, or 1v80 when it comes out.
Looks like it was probably the append, and I think it was less likely you hit the problem when just reading and writing - why I never spotted anything when I initially made the change.